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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Renderer.Canvas"></a>OpenLayers.<wbr>Renderer.<wbr>Canvas</h1><div class=CBody><p>A renderer based on the 2D &lsquo;canvas&rsquo; drawing element.</p><h4 class=CHeading>Inherits</h4><ul><li><a href="../Renderer-js.html#OpenLayers.Renderer" class=LClass id=link23 onMouseOver="ShowTip(event, 'tt23', 'link23')" onMouseOut="HideTip('tt23')">OpenLayers.Renderer</a></li></ul><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas" >OpenLayers.<wbr>Renderer.<wbr>Canvas</a></td><td class=SDescription>A renderer based on the 2D &lsquo;canvas&rsquo; drawing element.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.hitDetection" >hitDetection</a></td><td class=SDescription>{Boolean} Allow for hit detection of features. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.hitOverflow" >hitOverflow</a></td><td class=SDescription>{Number} The method for converting feature identifiers to color values supports 16777215 sequential values. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.canvas" >canvas</a></td><td class=SDescription>{Canvas} The canvas context object.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.features" >features</a></td><td class=SDescription>{Object} Internal object of feature/style pairs for use in redrawing the layer.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.pendingRedraw" >pendingRedraw</a></td><td class=SDescription>{Boolean} The renderer needs a redraw call to render features added while the renderer was locked.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.cachedSymbolBounds" >cachedSymbolBounds</a></td><td class=SDescription>{Object} Internal cache of calculated symbol extents.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas" >OpenLayers.<wbr>Renderer.<wbr>Canvas</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.setExtent" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">setExtent</a></td><td class=SDescription>Set the visible part of the layer.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.eraseGeometry" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">eraseGeometry</a></td><td class=SDescription>Erase a geometry from the renderer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.supported" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">supported</a></td><td class=SDescription>{Boolean} Whether or not the browser supports the renderer class</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.setSize" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">setSize</a></td><td class=SDescription>Sets the size of the drawing surface.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawFeature" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">drawFeature</a></td><td class=SDescription>Draw the feature. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawGeometry" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">drawGeometry</a></td><td class=SDescription>Used when looping (in redraw) over the features; draws the canvas.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawExternalGraphic" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">drawExternalGraphic</a></td><td class=SDescription>Called to draw External graphics.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawNamedSymbol" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">drawNamedSymbol</a></td><td class=SDescription>Called to draw Well Known Graphic Symbol Name. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.setCanvasStyle" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">setCanvasStyle</a></td><td class=SDescription>Prepare the canvas for drawing by setting various global settings.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.featureIdToHex" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">featureIdToHex</a></td><td class=SDescription>Convert a feature ID string into an RGB hex string.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.setHitContextStyle" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">setHitContextStyle</a></td><td class=SDescription>Prepare the hit canvas for drawing by setting various global settings.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawPoint" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">drawPoint</a></td><td class=SDescription>This method is only called by the renderer itself.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawLineString" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">drawLineString</a></td><td class=SDescription>This method is only called by the renderer itself.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawLinearRing" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">drawLinearRing</a></td><td class=SDescription>This method is only called by the renderer itself.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.renderPath" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">renderPath</a></td><td class=SDescription>Render a path with stroke and optional fill.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawPolygon" id=link16 onMouseOver="ShowTip(event, 'tt16', 'link16')" onMouseOut="HideTip('tt16')">drawPolygon</a></td><td class=SDescription>This method is only called by the renderer itself.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.drawText" id=link17 onMouseOver="ShowTip(event, 'tt17', 'link17')" onMouseOut="HideTip('tt17')">drawText</a></td><td class=SDescription>This method is only called by the renderer itself.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.getLocalXY" id=link18 onMouseOver="ShowTip(event, 'tt18', 'link18')" onMouseOut="HideTip('tt18')">getLocalXY</a></td><td class=SDescription>transform geographic xy into pixel xy</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.clear" id=link19 onMouseOver="ShowTip(event, 'tt19', 'link19')" onMouseOut="HideTip('tt19')">clear</a></td><td class=SDescription>Clear all vectors from the renderer.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.getFeatureIdFromEvent" id=link20 onMouseOver="ShowTip(event, 'tt20', 'link20')" onMouseOut="HideTip('tt20')">getFeatureIdFromEvent</a></td><td class=SDescription>Returns a feature id from an event on the renderer.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.eraseFeatures" id=link21 onMouseOver="ShowTip(event, 'tt21', 'link21')" onMouseOut="HideTip('tt21')">eraseFeatures</a></td><td class=SDescription>This is called by the layer to erase features; removes the feature from the list, then redraws the layer.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.redraw" id=link22 onMouseOver="ShowTip(event, 'tt22', 'link22')" onMouseOut="HideTip('tt22')">redraw</a></td><td class=SDescription>The real &lsquo;meat&rsquo; of the function: any time things have changed, redraw() can be called to loop over all the data and (you guessed it) redraw it. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.LABEL_ALIGN" >OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>LABEL_ALIGN</a></td><td class=SDescription>{Object}</td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.LABEL_FACTOR" >OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>LABEL_FACTOR</a></td><td class=SDescription>{Object}</td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.drawImageScaleFactor" >OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>drawImageScaleFactor</a></td><td class=SDescription>{Number} Scale factor to apply to the canvas drawImage arguments. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.hitDetection"></a>hitDetection</h3><div class=CBody><p>{Boolean} Allow for hit detection of features.&nbsp;  Default is true.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.hitOverflow"></a>hitOverflow</h3><div class=CBody><p>{Number} The method for converting feature identifiers to color values supports 16777215 sequential values.&nbsp;  Two features cannot be predictably detected if their identifiers differ by more than this value.&nbsp;  The hitOverflow allows for bigger numbers (but the difference in values is still limited).</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.canvas"></a>canvas</h3><div class=CBody><p>{Canvas} The canvas context object.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.features"></a>features</h3><div class=CBody><p>{Object} Internal object of feature/style pairs for use in redrawing the layer.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.pendingRedraw"></a>pendingRedraw</h3><div class=CBody><p>{Boolean} The renderer needs a redraw call to render features added while the renderer was locked.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.cachedSymbolBounds"></a>cachedSymbolBounds</h3><div class=CBody><p>{Object} Internal cache of calculated symbol extents.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.Constructor"></a>Constructor</h3></div></div>

<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas"></a>OpenLayers.<wbr>Renderer.<wbr>Canvas</h3><div class=CBody><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>containerID</td><td class=CDLDescription>{<a href="../BaseTypes-js.html#OpenLayers.String" class=LClass id=link24 onMouseOver="ShowTip(event, 'tt24', 'link24')" onMouseOut="HideTip('tt24')">String</a>}</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} Optional properties to be set on the renderer.</td></tr></table></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.Functions"></a>Functions</h3></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.setExtent"></a>setExtent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">setExtent: function()</td></tr></table></blockquote><p>Set the visible part of the layer.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>extent</td><td class=CDLDescription>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt25', 'link25')" onMouseOut="HideTip('tt25')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>resolutionChanged</td><td class=CDLDescription>{Boolean}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} true to notify the layer that the new extent does not exceed the coordinate range, and the features will not need to be redrawn.&nbsp; False otherwise.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.eraseGeometry"></a>eraseGeometry</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Erase a geometry from the renderer.&nbsp; Because the Canvas renderer has &lsquo;memory&rsquo; of the features that it has drawn, we have to remove the feature so it doesn&rsquo;t redraw.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link26 onMouseOver="ShowTip(event, 'tt26', 'link26')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.supported"></a>supported</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">supported: function()</td></tr></table></blockquote><h4 class=CHeading>Returns</h4><p>{Boolean} Whether or not the browser supports the renderer class</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.setSize"></a>setSize</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setSize: function(</td><td class="PParameter  prettyprint " nowrap>size</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the size of the drawing surface.</p><p>Once the size is updated, redraw the canvas.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>size</td><td class=CDLDescription>{<a href="../BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link27 onMouseOver="ShowTip(event, 'tt27', 'link27')" onMouseOut="HideTip('tt27')">OpenLayers.Size</a>}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawFeature"></a>drawFeature</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawFeature: function(</td><td class="PParameter  prettyprint " nowrap>feature,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Draw the feature.&nbsp; Stores the feature in the features list, then redraws the layer.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>feature</td><td class=CDLDescription>{<a href="../Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link28 onMouseOver="ShowTip(event, 'tt28', 'link28')" onMouseOut="HideTip('tt28')">OpenLayers.Feature.Vector</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{&lt;Object&gt;}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} The feature has been drawn completely.&nbsp;  If the feature has no geometry, undefined will be returned.&nbsp;  If the feature is not rendered for other reasons, false will be returned.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawGeometry"></a>drawGeometry</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Used when looping (in redraw) over the features; draws the canvas.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link29 onMouseOver="ShowTip(event, 'tt26', 'link29')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawExternalGraphic"></a>drawExternalGraphic</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawExternalGraphic: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Called to draw External graphics.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link30 onMouseOver="ShowTip(event, 'tt26', 'link30')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawNamedSymbol"></a>drawNamedSymbol</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawNamedSymbol: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Called to draw Well Known Graphic Symbol Name.&nbsp; This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link31 onMouseOver="ShowTip(event, 'tt26', 'link31')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.setCanvasStyle"></a>setCanvasStyle</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setCanvasStyle: function(</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Prepare the canvas for drawing by setting various global settings.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String} one of &lsquo;stroke&rsquo;, &lsquo;fill&rsquo;, or &lsquo;reset&rsquo;</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object} Symbolizer hash</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.featureIdToHex"></a>featureIdToHex</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>featureIdToHex: function(</td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Convert a feature ID string into an RGB hex string.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String} Feature id</td></tr></table><h4 class=CHeading>Returns</h4><p>{String} RGB hex string.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.setHitContextStyle"></a>setHitContextStyle</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setHitContextStyle: function(</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>symbolizer,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>strokeScaling</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Prepare the hit canvas for drawing by setting various global settings.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>type</td><td class=CDLDescription>{String} one of &lsquo;stroke&rsquo;, &lsquo;fill&rsquo;, or &lsquo;reset&rsquo;</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String} The feature id.</td></tr><tr><td class=CDLEntry>symbolizer</td><td class=CDLDescription>{<a href="../Symbolizer-js.html#OpenLayers.Symbolizer" class=LClass id=link32 onMouseOver="ShowTip(event, 'tt29', 'link32')" onMouseOut="HideTip('tt29')">OpenLayers.Symbolizer</a>} The symbolizer.</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawPoint"></a>drawPoint</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawPoint: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link33 onMouseOver="ShowTip(event, 'tt26', 'link33')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawLineString"></a>drawLineString</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawLineString: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link34 onMouseOver="ShowTip(event, 'tt26', 'link34')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawLinearRing"></a>drawLinearRing</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawLinearRing: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link35 onMouseOver="ShowTip(event, 'tt26', 'link35')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.renderPath"></a>renderPath</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>renderPath: function(</td><td class="PParameter  prettyprint " nowrap>context,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>type</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Render a path with stroke and optional fill.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawPolygon"></a>drawPolygon</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawPolygon: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="../Geometry-js.html#OpenLayers.Geometry" class=LClass id=link36 onMouseOver="ShowTip(event, 'tt26', 'link36')" onMouseOut="HideTip('tt26')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.drawText"></a>drawText</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawText: function(</td><td class="PParameter  prettyprint " nowrap>location,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>location</td><td class=CDLDescription>{&lt;OpenLayers.Point&gt;}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.getLocalXY"></a>getLocalXY</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getLocalXY: function(</td><td class="PParameter  prettyprint " nowrap>point</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>transform geographic xy into pixel xy</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>point</td><td class=CDLDescription>{<a href="../Geometry/Point-js.html#OpenLayers.Geometry.Point" class=LClass id=link37 onMouseOver="ShowTip(event, 'tt30', 'link37')" onMouseOut="HideTip('tt30')">OpenLayers.Geometry.Point</a>}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.clear"></a>clear</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote><p>Clear all vectors from the renderer.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.getFeatureIdFromEvent"></a>getFeatureIdFromEvent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getFeatureIdFromEvent: function(</td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns a feature id from an event on the renderer.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>{<a href="../Events-js.html#OpenLayers.Event" class=LClass id=link38 onMouseOver="ShowTip(event, 'tt31', 'link38')" onMouseOut="HideTip('tt31')">OpenLayers.Event</a>}</td></tr></table><h4 class=CHeading>Returns</h4><p>{&lt;OpenLayers.Feature.Vector} A feature or undefined.&nbsp;  This method returns a feature instead of a feature id to avoid an unnecessary lookup on the layer.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.eraseFeatures"></a>eraseFeatures</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseFeatures: function(</td><td class="PParameter  prettyprint " nowrap>features</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This is called by the layer to erase features; removes the feature from the list, then redraws the layer.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>features</td><td class=CDLDescription>{Array(<a href="../Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link39 onMouseOver="ShowTip(event, 'tt28', 'link39')" onMouseOut="HideTip('tt28')">OpenLayers.Feature.Vector</a>)}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.redraw"></a>redraw</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">redraw: function()</td></tr></table></blockquote><p>The real &lsquo;meat&rsquo; of the function: any time things have changed, redraw() can be called to loop over all the data and (you guessed it) redraw it.&nbsp;  Unlike Elements-based Renderers, we can&rsquo;t interact with things once they&rsquo;re drawn, to remove them, for example, so instead we have to just clear everything and draw from scratch.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.Constants"></a>Constants</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.LABEL_ALIGN"></a>OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>LABEL_ALIGN</h3><div class=CBody><p>{Object}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.LABEL_FACTOR"></a>OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>LABEL_FACTOR</h3><div class=CBody><p>{Object}</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Canvas.OpenLayers.Renderer.Canvas.drawImageScaleFactor"></a>OpenLayers.<wbr>Renderer.<wbr>Canvas.<wbr>drawImageScaleFactor</h3><div class=CBody><p>{Number} Scale factor to apply to the canvas drawImage arguments.&nbsp; This is always 1 except for Android 2.1 devices, to work around <a href="http://code.google.com/p/android/issues/detail?id=5141" class=LURL target=_top>http://code.google.com<wbr>/p<wbr>/android<wbr>/issues<wbr>/detail?id=5141</a>.</p></div></div></div>

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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">setExtent: function()</td></tr></table></blockquote>Set the visible part of the layer.</div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Erase a geometry from the renderer. </div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">supported: function()</td></tr></table></blockquote>{Boolean} Whether or not the browser supports the renderer class</div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setSize: function(</td><td class="PParameter  prettyprint " nowrap>size</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the size of the drawing surface.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawFeature: function(</td><td class="PParameter  prettyprint " nowrap>feature,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draw the feature. </div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Used when looping (in redraw) over the features; draws the canvas.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawExternalGraphic: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Called to draw External graphics.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawNamedSymbol: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Called to draw Well Known Graphic Symbol Name. </div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setCanvasStyle: function(</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Prepare the canvas for drawing by setting various global settings.</div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>featureIdToHex: function(</td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Convert a feature ID string into an RGB hex string.</div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setHitContextStyle: function(</td><td class="PParameter  prettyprint " nowrap>type,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>symbolizer,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>strokeScaling</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Prepare the hit canvas for drawing by setting various global settings.</div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawPoint: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This method is only called by the renderer itself.</div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawLineString: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This method is only called by the renderer itself.</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawLinearRing: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This method is only called by the renderer itself.</div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>renderPath: function(</td><td class="PParameter  prettyprint " nowrap>context,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>type</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Render a path with stroke and optional fill.</div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawPolygon: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This method is only called by the renderer itself.</div></div><div class=CToolTip id="tt17"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawText: function(</td><td class="PParameter  prettyprint " nowrap>location,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This method is only called by the renderer itself.</div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getLocalXY: function(</td><td class="PParameter  prettyprint " nowrap>point</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>transform geographic xy into pixel xy</div></div><div class=CToolTip id="tt19"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote>Clear all vectors from the renderer.</div></div><div class=CToolTip id="tt20"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getFeatureIdFromEvent: function(</td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns a feature id from an event on the renderer.</div></div><div class=CToolTip id="tt21"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseFeatures: function(</td><td class="PParameter  prettyprint " nowrap>features</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This is called by the layer to erase features; removes the feature from the list, then redraws the layer.</div></div><div class=CToolTip id="tt22"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">redraw: function()</td></tr></table></blockquote>The real &lsquo;meat&rsquo; of the function: any time things have changed, redraw() can be called to loop over all the data and (you guessed it) redraw it. </div></div><div class=CToolTip id="tt23"><div class=CClass>This is the base class for all renderers.</div></div><div class=CToolTip id="tt24"><div class=CClass>Contains convenience functions for string manipulation.</div></div><div class=CToolTip id="tt25"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt26"><div class=CClass>A Geometry is a description of a geographic object. </div></div><div class=CToolTip id="tt27"><div class=CClass>Instances of this class represent a width/height pair</div></div><div class=CToolTip id="tt28"><div class=CClass>Vector features use the OpenLayers.Geometry classes as geometry description. </div></div><div class=CToolTip id="tt29"><div class=CClass>Base class representing a symbolizer used for feature rendering.</div></div><div class=CToolTip id="tt30"><div class=CClass>Point geometry class.</div></div><div class=CToolTip id="tt31"><div class=CClass>Utility functions for event handling.</div></div><!--END_ND_TOOLTIPS-->




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